1980998887 has 8 divisors (see below), whose sum is σ = 2264334336. Its totient is φ = 1697747352.

The previous prime is 1980998879. The next prime is 1980998891. The reversal of 1980998887 is 7888990891.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1980998887 - 2³ = 1980998879 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1980998807) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42378 + ... + 75880.

It is an arithmetic number, because the mean of its divisors is an integer number (283041792).

Almost surely, 2^1980998887 is an apocalyptic number.

1980998887 is a deficient number, since it is larger than the sum of its proper divisors (283335449).

1980998887 is an equidigital number, since it uses as much as digits as its factorization.

1980998887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41957.

The product of its (nonzero) digits is 20901888, while the sum is 67.

The square root of 1980998887 is about 44508.4136652836. The cubic root of 1980998887 is about 1255.9183633820.

The spelling of 1980998887 in words is "one billion, nine hundred eighty million, nine hundred ninety-eight thousand, eight hundred eighty-seven".